{{Short description|Species of gastropod}} {{Use dmy dates|date=February 2025}} {{Speciesbox | name = Moapa pebblesnail | image = | status = VU | status_system = IUCN3.1 | status_ref = <ref name="iucn status 16 November 2021">{{cite iucn |author=Cordeiro, J. |author2=Perez, K. |date=2011 |title=''Pyrgulopsis avernalis'' |volume=2011 |article-number=e.T40047A10311032 |doi=10.2305/IUCN.UK.2011-2.RLTS.T40047A10311032.en |access-date=16 November 2021}}</ref> | status2 = G1 | status2_system = TNC | status2_ref = <ref name=NS>{{cite NatureServe |id=2.118852 |title=''Pyrgulopsis avernalis'' |access-date=6 April 2026}}</ref> | genus = Pyrgulopsis | species = avernalis | authority = (Pilsbry, 1935) | synonyms = {{Species list |Fluminicola avernalis|Pilsbry}} | synonyms_ref = <ref name=WoRMS>{{cite WoRMS |id=991517 |title=''Pyrgulopsis avernalis'' (Pilsbry, 1935) |db=mollusc |access-date=27 April 2026}}</ref> }}

The '''Moapa pebblesnail''' also known as the '''Muddy Valley turban snail''', scientific name '''''Pyrgulopsis avernalis''''', is a species of small freshwater snail with an operculum, an aquatic gastropod mollusk in the family Hydrobiidae.

The natural habitat of this species is springs,<ref name=review>{{cite book|last1=Hershler|first1=Robert|title=A Review of the North American Freshwater Snail Genus ''Pyrgulopsis'' (Hydrobiidae)|url=https://archive.org/details/reviewofnorthame0000hers_x4k5|url-access=registration|date=1994|publisher=Smithsonian Institution Press|location=Washington, DC}}</ref> and it is currently threatened by habitat loss. This species is endemic to the Moapa Valley, Nevada, United States<ref name=review /> and the common name refers to the Moapa River in Nevada.

==Description== ''Pyrgulopsis avernalis'' is a small snail that has a height of {{convert|2.4|-|4.3|mm|in}} and ovate conical shell. Its differentiated from other ''Pyrgulopsis'' in that its penial filament has a small lobe and large filament with the penial ornament consisting of a small terminal gland, a gland along the outer edge of the penial lobe and a ventral gland.<ref name=review />

==Genus transfer== When originally described in 1935, it was assigned to the genus ''Fluminicola''. In 1994, it was transferred to the genus ''Pyrgulopsis''.<ref name=review />

==References== {{Reflist}}

{{Taxonbar|from1=Q3137889|from2=Q308302}}

Category:Pyrgulopsis Category:Gastropods described in 1935 Category:Molluscs of the United States Category:Taxonomy articles created by Polbot Category:Taxa named by Henry Augustus Pilsbry

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